Eh, I made it a point to not abuse power when I was a mod, but I'm sure there were times I was slightly heavy handed where I didn't need to be, and lax in the case of some people who deserved a heavy hand. I don't think anyone on the staff really abuses power though.
Well, tell a lie, I did used to edit my friends VMs all the time, but that's different ;]
I've moderated in several other small forums, and I can be pretty strict, but most of the time I am very much a fair-minded person when I am tasked with that.